Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D301/00—Preparation of oxiranes
  • C07D301/02—Synthesis of the oxirane ring
  • C07D301/03—Synthesis of the oxirane ring by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds
  • C07D301/04—Synthesis of the oxirane ring by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds with air or molecular oxygen
  • C07D301/08—Synthesis of the oxirane ring by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds with air or molecular oxygen in the gaseous phase
  • C07D301/10—Synthesis of the oxirane ring by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds with air or molecular oxygen in the gaseous phase with catalysts containing silver or gold
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
  • B01J21/02—Boron or aluminium; Oxides or hydroxides thereof
  • B01J21/04—Alumina
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
  • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
  • B01J23/48—Silver or gold
  • B01J23/50—Silver
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D301/00—Preparation of oxiranes

Definitions

• the present invention relates to an oxidation process such as the oxidation of ethylene to ethylene oxide wherein the oxidation is carried out using a fixed bed solid catalyst which comprises a mixture of a solid active oxidation catalyst such as a supported silver catalyst together with an inert diluent solid which has been treated with a base.
• a fixed bed solid catalyst which comprises a mixture of a solid active oxidation catalyst such as a supported silver catalyst together with an inert diluent solid which has been treated with a base.
• inert diluent A problem which has existed in such systems where the oxidation catalyst has been diluted with inert material has been the tendency for the inert diluent solid to actually promote degradation of the desired product.
• the inert diluent is generally not completely inert but rather has active surface sites which promote product loss.
• the concentration of the different alkali metals on the carrier's surface is generally determined via the acid-leachables test.
• the carrier sample is digested in a nitric acid solution.
• the alkali metals' concentration in the resulting solution is determined by atomic absorption spectro-photometry, Varian AA-110, in an air/acetylene flame.
• quantification is performed by aspirating the solutions into an inductively coupled plasma spectrophotometer, Spectro-analytical EOP ICP.
• the inert particular solid which has been base treated, is admixed with conventional oxidation catalyst to the extent necessary to achieve the desired dilution.
• the inert support is appropriately immersed in an aqueous solution of an alkali metal compound such as the hydroxide, carbonate, acetate, and the like for a time sufficient to deposit the basic material on the support surface, e.g. one (1) minute to ten (10) hours or more.
• the support is removed from the basic solution and dried, and is then suitable for blending with the solid oxidation catalyst.
• the base treated inert is blended in amounts ranging from about 5 to 80 wt % of the combined weight of the inert and catalyst although, as above indicated the base treated inert can comprise 100% of the solids in a preheat section of the reactor tube.
• the catalyst was tested by charging 9 g to a stainless steel reactor tube which was then heated by a molten salt bath. A gas mixture comprising 15% ethylene, 7% oxygen, and 78% inerts, mainly nitrogen and carbon dioxide, was passed through the catalyst at 300 psig. The temperature of the reaction was adjusted in order to obtain ethylene oxide productivity of 160 Kg per hour per m 3 of catalyst. After one week of reaction time the performance of the catalyst was stable and the calculated selectivity, to ethylene oxide, was 83.3%.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Catalysts (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
• Epoxy Compounds (AREA)

Priority Applications (12)

Applications Claiming Priority (1)

Publications (2)

Family

ID=34552729

Family Applications (1)

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Cited By (7)

Families Citing this family (5)

Citations (1)

Family Cites Families (9)

• 2003
  • 2003-11-10 US US10/714,378 patent/US6939979B2/en not_active Expired - Lifetime
• 2004
  • 2004-11-01 TW TW093133224A patent/TW200523018A/zh unknown
  • 2004-11-09 WO PCT/US2004/037274 patent/WO2005046856A2/en not_active Ceased
  • 2004-11-09 AU AU2004289693A patent/AU2004289693A1/en not_active Abandoned
  • 2004-11-09 EP EP04800893A patent/EP1684896A4/en not_active Withdrawn
  • 2004-11-09 CA CA002545297A patent/CA2545297A1/en not_active Abandoned
  • 2004-11-09 RU RU2006119192/04A patent/RU2335498C2/ru not_active IP Right Cessation
  • 2004-11-09 KR KR1020067011236A patent/KR20060131777A/ko not_active Ceased
  • 2004-11-09 JP JP2006539727A patent/JP2007510740A/ja active Pending
  • 2004-11-09 MX MXPA06005169A patent/MXPA06005169A/es active IP Right Grant
  • 2004-11-09 BR BRPI0416352-4A patent/BRPI0416352A/pt not_active IP Right Cessation
  • 2004-11-09 CN CNA200480032955XA patent/CN1926123A/zh active Pending

Patent Citations (1)

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